What is the reason for the Volkswagen CC's fan not stopping after turning off the engine?

[Gordon]

The reason the radiator fan continues to run after the car is turned off is to protect the engine and prevent the car from catching fire. Protecting the engine: If the engine coolant temperature at the moment of parking is higher than the acceptable soaking temperature for the engine, the car's computer will automatically calculate the fan's operating speed and duration, thereby controlling the fan's operation. The higher the engine temperature, the longer the fan runs after parking; when the engine coolant temperature drops below the soaking temperature, the fan turns off. This protects the engine and extends its service life. Preventing car fires: In ordinary cars, the cooling system stops working after the engine is turned off, often causing the engine temperature to rise further after shutdown, leading to damage. Therefore, modern high-end cars are equipped with an automatic cooling function. The radiator's power is directly connected to the battery, so even after the engine is turned off, if the temperature remains high, the radiator fan continues to operate for a while until the temperature cools down before stopping, to avoid high temperatures causing the car to catch fire.